imx: mx6quq7: fix USDHC4 declaration

USDHC2 does not exist on mx6quq7 board, as USDHC4 was already been
declared this is probably a typo.

Signed-off-by: Julien Corjon <corjon.j@ecagroup.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>

board/seco/mx6quq7/mx6quq7.c

@@ -93,7 +93,7 @@ int board_eth_init(bd_t *bis)
 
 static struct fsl_esdhc_cfg usdhc_cfg[2] = {
 	{USDHC3_BASE_ADDR},
-	{USDHC2_BASE_ADDR},
+	{USDHC4_BASE_ADDR},
 };
 
 int board_mmc_init(bd_t *bis)